Developers, the game is amazing and not adding more would be a sin and will make dolphins cry.
Please don't sit on this game too long. I was very impressed with what I played and can see this game blowing up if it moves past this initial stage.
Even with the design loopholes everyone is figuring out (with the main one being fighting an enemy who doesn't attack and exploiting card rules-I got a card up to over 450 damage after grinding) I think the big make-or-break mechanic will be how dying is approached.
Some sort of mechanic to get a card you built up back will make it worth playing again. Maybe add a shop keeper that sells 3 of your old cards picked randomly? Or a shroom token to turn in for one of your old cards? Something. Anything. Anyway, keep it up!